ice: Add NDO callback to set the maximum per-queue bitrate
Allow for rate limiting Tx queues. Bitrate is set in
Mbps(megabits per second).
Mbps max-rate is set for the queue via sysfs:
/sys/class/net/<iface>/queues/tx-<queue>/tx_maxrate
ex: echo 100 >/sys/class/net/ens7/queues/tx-0/tx_maxrate
echo 200 >/sys/class/net/ens7/queues/tx-1/tx_maxrate
Note: A value of zero for tx_maxrate means disabled,
default is disabled.
Signed-off-by: Usha Ketineni <usha.k.ketineni@intel.com>
Co-developed-by: Tarun Singh <tarun.k.singh@intel.com>
Signed-off-by: Tarun Singh <tarun.k.singh@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 5f3a692..cacbe21 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3649,6 +3649,48 @@ static void ice_set_rx_mode(struct net_device *netdev)
}
/**
+ * ice_set_tx_maxrate - NDO callback to set the maximum per-queue bitrate
+ * @netdev: network interface device structure
+ * @queue_index: Queue ID
+ * @maxrate: maximum bandwidth in Mbps
+ */
+static int
+ice_set_tx_maxrate(struct net_device *netdev, int queue_index, u32 maxrate)
+{
+ struct ice_netdev_priv *np = netdev_priv(netdev);
+ struct ice_vsi *vsi = np->vsi;
+ enum ice_status status;
+ u16 q_handle;
+ u8 tc;
+
+ /* Validate maxrate requested is within permitted range */
+ if (maxrate && (maxrate > (ICE_SCHED_MAX_BW / 1000))) {
+ netdev_err(netdev,
+ "Invalid max rate %d specified for the queue %d\n",
+ maxrate, queue_index);
+ return -EINVAL;
+ }
+
+ q_handle = vsi->tx_rings[queue_index]->q_handle;
+ tc = ice_dcb_get_tc(vsi, queue_index);
+
+ /* Set BW back to default, when user set maxrate to 0 */
+ if (!maxrate)
+ status = ice_cfg_q_bw_dflt_lmt(vsi->port_info, vsi->idx, tc,
+ q_handle, ICE_MAX_BW);
+ else
+ status = ice_cfg_q_bw_lmt(vsi->port_info, vsi->idx, tc,
+ q_handle, ICE_MAX_BW, maxrate * 1000);
+ if (status) {
+ netdev_err(netdev,
+ "Unable to set Tx max rate, error %d\n", status);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
* ice_fdb_add - add an entry to the hardware database
* @ndm: the input from the stack
* @tb: pointer to array of nladdr (unused)
@@ -5159,6 +5201,7 @@ static const struct net_device_ops ice_netdev_ops = {
.ndo_validate_addr = eth_validate_addr,
.ndo_change_mtu = ice_change_mtu,
.ndo_get_stats64 = ice_get_stats64,
+ .ndo_set_tx_maxrate = ice_set_tx_maxrate,
.ndo_set_vf_spoofchk = ice_set_vf_spoofchk,
.ndo_set_vf_mac = ice_set_vf_mac,
.ndo_get_vf_config = ice_get_vf_cfg,
